Zhou Kaiyu, Maugard Vincent, Zhang Wenming, Zhou Joe, Zhang Xuehua
Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
Nanomaterials (Basel). 2023 Apr 27;13(9):1496. doi: 10.3390/nano13091496.
Recent developments in ultrafine bubble generation have opened up new possibilities for applications in various fields. Herein, we investigated how substances in water affect the size distribution and stability of microbubbles generated by a common nanobubble generator. By combining light scattering techniques with optical microscopy and high-speed imaging, we were able to track the evolution of microbubbles over time during and after bubble generation. Our results showed that air injection generated a higher number of microbubbles (<10 μm) than CO injection. Increasing detergent concentration led to a rapid increase in the number of microbubbles generated by both air and CO injection and the intensity signal detected by dynamic light scattering (DLS) slightly increased. This suggested that surface-active molecules may inhibit the growth and coalescence of bubbles. In contrast, we found that salts (NaCl and NaCO) in water did not significantly affect the number or size distribution of bubbles. Interestingly, the presence of oil in water increased the intensity signal and we observed that the bubbles were coated with an oil layer. This may contribute to the stability of bubbles. Overall, our study sheds light on the effects of common impurities on bubble generation and provides insights for analyzing dispersed bubbles in bulk.
超细微泡产生技术的最新进展为其在各个领域的应用开辟了新的可能性。在此，我们研究了水中的物质如何影响由普通纳米气泡发生器产生的微泡的尺寸分布和稳定性。通过将光散射技术与光学显微镜和高速成像相结合，我们能够跟踪微泡在产生过程中和产生后随时间的演变。我们的结果表明，注入空气产生的微泡（<10μm）数量比注入CO产生的微泡数量更多。洗涤剂浓度的增加导致通过注入空气和CO产生的微泡数量迅速增加，并且通过动态光散射（DLS）检测到的强度信号略有增加。这表明表面活性分子可能会抑制气泡的生长和聚并。相比之下，我们发现水中的盐（NaCl和NaCO）对气泡的数量或尺寸分布没有显著影响。有趣的是，水中油的存在增加了强度信号，并且我们观察到气泡被一层油膜覆盖。这可能有助于气泡的稳定性。总的来说，我们的研究揭示了常见杂质对气泡产生的影响，并为分析大量分散气泡提供了见解。
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